As title states, the question is can Saison yeast use lactose?
i.e. is it possible to sweeten a Saison with lactose? Or, sweeten it possibly some other way?
This is about Saison yeasts, dry or liquid.
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Saison yeasts do not metabolise lactose, therefore it can be used to sweeten your Saisons if you wish to do so.
Lactose is not fermentable by Saccharomyces brewers yeasts, there are some yeast strains that can work their magic on lactose or galactose.
Some strains of Brett can ferment out lactose others cannot. Here is a table from Gilliland 1961:
I cannot think of any strain of brewer's yeast that will take on lactose, but as mentioned different fermentations like sours and lambics can work with lactose and its derivatives. The fact that yeast can barely digest lactose is how people get milky flavors for things like cream stouts. The milk sugar just hangs around for flavor.